Sizing device for internal-grinding machines



March 13, 192s. 1,662,213

A. P. STEINER sIzING DEVICE Non INTERNAL @BINDING MACHINES Filed oct. 21. 192e s sheets-sheet 1 IN VEN TOR. m. JD. GS'teL'nez".

" .4 oRNEY.

March 13, 1928. 1,662,213

. A. P. STEINER SIZING DEVICE FOR INTERNAL GRINDING MACHINES Filed Oct. 21, 1926 3 Sheets-Sheet 3 INVEN TOR. mos. f3. @tedneu /1 U AT RNEY.

Patented Mar. 13, 1928.

UNITED STATES ALTOS I. STEINER, OF WAYNESBORO, COMPANY, OF WAYNESBORO, VANIA.

PENNSYLVANIA, ASSIGNOR TO LANDIS TOOL PENNSYLVANIA, A CORPORATION OF PENNSYL- SIZING DEVICE FOR INTERNAL-GRINDING- MACHINES.

Application filed October 21, 1926. Serial No. 143,249.

My invention relates to an automatic work-sizing device for grinding machines. Heretofore it has been necessary for the operator to remove the grinding wheel from the work and measure the ground surface with a gage or calipers to ascertain'the degree of the grinding. The main object of this device is to automatically indicate eX- actly when the grinding has, reached the proper point. Another object is to control the feed or advance of the indicating device 25 Figure 1 is a plan view of the sizing de vice and a portion of the vmachine upon.

which it is mounted, Y 1 l Figure 2, a front elevationkof the device partly in section, and

30 Figure 3, a section on the-line 3-3 of' Figure 2. Y

In the drawings, the numeral 10 denotes the base of a ball-race grinder, 11 the wheel carriage, 12 the grinding wheel, 13 the head- 35 stock and 14 the work, which is securely held against a chuck 15 by means of the collar 16. Surrounding the chuck 15 is a casting 16 forming a water-guard and also a support orthe sizing device.

The sizing device comprises a casting 17 having a horizontallyr disposed pressure cylinder 18 positioned at an angle with respect to the axis of the work and a vertically disposed shaft housing 19, the axis of the cyl- 45 inder 18 being tangent to the cylinder housing 19. The casting 17 is secured to the wa-y ter guard 16 by means of a T-headed bolt 20 carried by said casting with its head hitting into a slot 21 formed in the water 50 uard. A piston'22 having an extension 23 1s adapted to operate in the cylinder 18 and ais carried on the end of a rod 24 which passesthrough a stuing box 25 secured to the open end of the cyhnder. A spring 26 is confined between the piston and the stuifing box to force the piston towards the closed end of the cylinder. The opposite end of the rod 24 carries a rack 27 which operates within a housing 28 bolted to the top of the housing 19 and which meshes with a pinion 29 loosely mounted on a spindle 30 provided with ball bearings 31 to insure easy operation. A collar 32 is secured to the spindle by a set screw 33 and carries a small pin 34 projecting from its side and engaging in a. relatively large slot 35 in the pinion 29. The pin 34 provides driving connection between the pinlon and the collar 32. Since the pin is much smaller than the slot in which it fits, a lost motion is permitted between the pinion and collar to eliminate any sudden jarring of the parts.

On the end of the spindle 30 adjacent the pinion 29 is an indicator arm 36, the free end of which rests against a plunger 37 of an indicator -38 designed to indicate to the operator, done. The spindle 30 is normally held under tension in one direction byia spring 39 which encircles the spindle and has one end anchored in a collar 40 held by a pin 41 to the `housing 19 and its other end anchored in a vnut 42 threaded on the spindle 30 and conned thereon by a similar lock nut 43. A eeler-arm 44 is pinned to the end of the spindle oppos1te the indicator arm 36 and is adapted to rest against the surface on the work which is being ground.

The cylinder 18 has an inlet port 45' communicating with pressure pipe 45 between the end of the cylinder and the piston 22 and a cylinder drain port 46 communicating with a drain pipe 46 which is designed to carry ofi any fluid which may leak past the piston and into the cylinder.

The eeler arm! 44 and indicator arm 36 being both keyed to the spindle, work in unison and are controlled entirely by the piston 22 which is designed to cause the entire sizing device to enter the position in the work slowly and leave it rap1dly. by the following` operation:

When a piece of work 14 has been ground to size, the grinding wheel 12 iswithdrawn. When the wheel carriage reaches the limit to which it maybe withdrawn, a dog 47 (Fig. 1) "strikes the head'on a valve stem 48 of a valve 49, normally held closed by a.

the exact condition of the work being' spring 50, opening the valve and allowing fluid under pressure to pass from a supply pipe 5l through the pressure line 52 to a T connection 53 where the line divides, one division leading to a needle valve 54 and the other to a check-valve 55. Both valves then connect to another T connection 5G to the pipe 45 leading to the cylinder 18. lVhen the pressure fluid is moving towards the cylinder 18, it follows the path of least i'esistances, which is through the check-valve 55 since the needle valve is always kept sufiiciently closed to provide a very restricted passage therethrough. Said pressure fluid enters the cylinder 18 and acts against the piston 22 which in turn moves the rack 27 and pinion 29 in such a direction as to turn the spindle 30 carrying the feelcr arm 44 away from the work and the indicator arm 36 away from the indicator so that the work may be removed from the chuck.

lVhen a new piece of work is placed 1n the chuck, and the grinding wheel is moved towards the work, the dog 47 releases the valve stem 48 which is returned to its normal or exhaust position by the spring 50. With t-he valve-piston in this position, the pressure fluid is forced out of the cylinder 18 by the action of the spring 26 against the piston 22. The pressure fluid cannot return through the clieck-valve 55 so it escapes through the needle-valve 54 which is adjusted to allow the parts to move slowly thereby allowing the feeler-arm 44 to engage the work 14 slightly ahead of the grinding wheel 12 thereby preventing any damage to the indicator by the indicator arm 44 engaging therewith. The pressure Huid which is exhausted from the cylinder 18 by the pressure of the spring 26 passes through the pipe 45 to the valve 49 then returns to the storage tank through the pipe 57.

It will be obvious to those skilled in the art, that various changes may be made in my device without departing from the spirit of my invention and therefore I do not limit myself to what is shown in the drawings and described in the specification but only as indicated in the appended claims.

Having thus described my said invention, what I claim as new and desire to secure by Letters Patent, is:

1. The combination with a grinding machine having a work holding chuck, of a water guard around said chuck and a hydraulic sizing device carried by said water guard and means controlled bythe movement of the grindingmacliine carriage for moving the sizing device into and out of operative position, substantially as set forth.

2. The combination with a grinding machine having a work holding chuck, of a water ard around said chuck, said water guard aving a T slot formed therein, a hydraulic sizing device carried by said water guard and a bolt carried by said sizing device and engaging said slot to secure the two together, substantially as set forth.

The combination with an internal grinding machine having a work-liolding chuck and a water guard around said chuck, of a sizing device coinpiising a feeler arm for engaging the work, an indicating arm for engaging an indicator, means for eugaging said arms against said work and indicator and separate means for diseiigaging said arms therefrom, substantially as set forth.

4. The combination with an internal grinding machine having a work-holding chuck and a water-guard surrounding said chuck, of a sizing device secured to said water-guard and comprising a fccler arni for engaging the work, an indicator, an arm for engaging said indicator, incclninical means for engaging said arms with said work and indicator and hydraulic means for disengaging said arm therefrom, substantially as set forth.

5. The combination with an internal grinding machine having a work-holding chuck and a water guard, of a sizing device carried by said water guard and comprising a casting having a vertical cylindrical housing, a spindle joui'nallcd in said housing, an indicator, an arm to operate said indicator on one end of said spindle, a work engaging feeler arm on the opposite end of said spindle and tension means to hold said arms against said indicator and work, substantially as set forth.

6. A work sizing device for internal grinders comprising a casting, an indicator on said casting, a vertical housing in said casting, a spindle in said housing, an indicator engaging arm on said spindle, a work engaging arm on said spindle, a collar surrounding said spindle and secured to said housing, a collar secured to said spindle, a spring under tension connecting said collars to hold said arms into their respectivo engagement and hydraulic means for disengaging said arms, substantially as set forth.

A work sizing device for internal grinders comprising a cast-ing, an indicator on said casting, a vertical housing in said casting, a spindle journallcd in said housing, an indicator engaging arm and work engaging arm on said spindle, a pinion loosely mounted on said spindle, a collar keyed to said spindle adjacent said inion, a slot in said pinion, a pin on said co lar engaging said slot and hydraulic means to rotate said pinion and spindle, substantially as set fort .8. A work sizing device for internal grinders comprising a casting, an indicator on s aid casting, a vertical housing in said casting, a spindle journalled in said housing,

an indicator enga-ging arm and work engagloo .ng armonsaid spindle, pinion driving means for said cylinder and means on said Wheel on said spindle, a horizontal cylinder in said carriage to control the flow of fluid to said casting, a piston and piston rod in said cylcylinder, substantially as set forth.

inder, a rack on said iston rod engagmg 10. The combination of an internal said pinion, mechanical) means for forcing grindingl machine having a base, a reciprosaid piston in one direction, pressure Huid (cating Wheel carriage on said base, a Work means for forcing said piston in the opposite holding chuck and a Water guard, of a work direction and means to control said pressure sizing device, a fluid pressure cylinder for fluid, substantially as set forth. operating said device, a fluid supply line,

9. The combination of an internal grinda two-way valve in said line, a check-valve v ing-machine having a base, a reciprocating in said line, a -by-pass around said check- Wheel carriage on said base, a Work holding valve, a needle-valve in said by-pass, a fluid chuckand a Water guard,'of a work sizing line from said two-Way valve and an arm device comprising a casting, a spindle jouron said Wheel-carriage to operate said twonalled in said casting, an indicator, an in- Way valve, substantially as set forth. dicator engaging arm and a work engaging In Witness whereof, I have hereunto set arm on said spindle, a fluid cylinder 1n said my hand at Waynesboro, Pennsylvania, this casting, a piston and piston rod in said cyl- 18th daycof October, A. D. nineteen huninder, a rack on said piston rod en aging dred and twenty-six.

a pinion on said spindle, a uid supply line AMOS P. STEINER. 

